Bingo. There's been people do it successfully, but I consider the risk to outweigh the reward myself. The reason for doing it is that your 2nd card will be higher temps than the 1st card if you plumb them in series, but should be equal if plumbed in parallel. Personally, my CPU OC is more important to me than maxing my GPU OC.

I see, So they "Y" the inlet and "Y" the outlet.... Lets see how that looks. *goes to paint*